New York Agricultural Experiment Station. 299 



foliage and better fruit than those of neighboring vineyards which 

 had a better outlook early in the season but which were not. 

 sprayed. The chemical analyses of fruit from sprayed and un- 

 sprayed vines in the same vineyard are shown in Table I. 



J. DUNHAM VINEYARD. 



This vineyard was near Brocton. Several portions of it were 

 more severely infested than others. Here the importance of 

 destroying the hibernating places was shown; for the severest 

 injury in this planting always occurred in areas adjoining situa- 

 tions which oifered shelter to the insects during the winter. It 

 should be said that, for the season, this was only a moderately- 

 infested vineyard. S'praying was done on July 15 to 17 and 

 " Black Leaf 40 " was used with bordeaux mixture. The nymphs 

 were killed and the foliage remained green. This vineyard was 

 surrounded by others which were not sprayed, and during Sep- 

 tember it stood like an island of green in a sea of yellow. The 

 effect of the treatment on the fruit is shown in Table I. 



A. FREELING VINEYARD. 



The effect of proximity of spring food-plants and favorable 

 winter quarters was clearly shown in this vineyard, which was at 

 Westfield. Cultivated raspberries were the food plants, while 

 grassland aided in sheltering the insects. The vines were severely 

 infested and were sprayed on July 16 and 17, and one applica- 

 tion only of nicotine extract was made. The foliage of the 

 sprayed vines remained green longer than that of the unsprayed 

 ones and the difference in quality of the fruit will be noted in 

 the analyses. Table I. 



N. FEINEN AND G. o'bRIAN VINEYARDS. 



Since these two vineyards, at Fredonia, are similarly located 

 and were in all respects alike so far as the control of the leaf- 

 hopper is concerned, the spraying operations are considered as 

 one experiment. The sources of infestation were grassland and 



